cassandra requires java to be installed manually before it's installation, this commit is for the same.
cassandra requires java to be installed manually before it's
installation, this commit is for the same.

Change-Id: I8881b38990165c5e25d17afad68c119072da5e52
Partial-Bug: #1513575

Juniper/contrail-fabric-utils,Juniper/contrail-fabric-utils